To provide an apparatus for anodic oxidation-treatment with which a uniform anodic oxidized film is formed, even to a treating material of aluminum alloy having any shape.

This anodic oxidation-treatment apparatus 1 is composed of an electroconductive rotary shaft 3 parallel disposed with the vessel bottom part of an electrolytic vessel 20, an electroconductive holding tools 6 radially arranged for holding the treating materials 5 composed of the aluminum alloy at the outer periphery of the rotary shaft 3, a motor 10 and gears 9a-9c for rotating the rotary shaft 3 and electric supplying plates 8 for supplying the electric power to the rotary shaft 3 for energizing to the holding tools 6. When the rotary shaft 3 is rotated with the rotation driving mechanism 10, 9a-9c, since the treating materials held with the holding tools 6, are passed through between the vessel bottom part and solution surface part of the electrolytic vessel 20, the treating materials 5 disposed at any position are passed through between the vessel bottom part and the solution surface part in spite of existence of temperature differences in the electrolytic vessel 20, the treating materials 5 are treated under almost the same condition, and thus, the film thicknesses of the treating materials 5 can be uniformed.